Guard for punch-presses.



P. T. CHAPLEAU.

GUARD FOR PUNCH PRESSES. H APPLICATION FILED JAN.15, 1915. I

PatentedSept. 1 1-, 1915.

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PM 1." czw zmz P. T. CHAPLEA'U.

GUARD FOR PUNCH PRESSES. APPLICATI YLON FILED JAN. 15. 1915.

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Patented Sept. 14, 1915.

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supported member adapted to be swung auiJTdXTED STATES rATENToFFIo IPHILEAS T. CHAPLEAU, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN CUTLERY COMPANY, 'OF CHICAGO, ILLINOIS,'A CORPORATION OF ILLINOIS.

GUARD FOR PUNCH-PBESSES.

Specification of LettersPatent. Patented Sept '14, 1915.

Application filed January 15. 1915. Serial 110.2,370. v

Guards for Punch-Presses, of which the fol lowing is a specification.

My invention relates to guards forpunchpresses, of the variety involving a hingedly tomatically from a position in which it does not obstruct the workman in positioning the work to be operated on by the punch-press when the plunger of the press is in raised position, to a position in which .the hands of the operator, should they remain in a dangerous position while the plunger is descending, will be forced out of the path of the punch; my object being to provide a novel, simple and inexpensive form of guard of this general character which may be-read-. ily adjusted to machines of difierent sizes as well as to plungers of different sizes and presenting different lengths of stroke.

Referring to the accompanying drawings,

Figure .1 is a View in side elevation of a portion of apunch-pr'ess of common form equipped with a guard constructed 1n accordance with my invention, the guard being shown in the position it occupies when the plunger is uppermost.v Fig. 2 is a similar view showing the position occupied by the guard when the plunger hasinoved to its lowermost position. Fig. 3 is a view in frontelevation of the punch-press of Fig. 1; and Fig. 4, a perspective View of the guard-proper rem oved from themachine, a

' portion thereof being shown insection.

As the punch-press illustratedis one of common form, a brief description thereof 7 only. will suffice. The frame of the punchconfined to be reciprocated up and down by press is represented at 5, it being equipped with guides 6 in which the plunger 7 carrying the male die elements or punch 8, is

mechanism, not shown, the punch 8 coiiperating with the die block 9 located below them and upon which the work to be operated on would be positioned.

The guard prop'er of myimprovc'd construction is represented at 10, it being 'of eneral yoke shape with the extremities of its upper ends deflected, as represented at 11,

to form trunnions at which it is adapted to p be jour'naled in operative position. In the 1 construction illustrated, the trunnions 11 are confined in openings 12 in clips 13 bolted to the removable sections .of the guides 6, the

clips 13 being readily attached to these guides by certain of the screws 14 com:

monly provided for securing these remov-.

able guides to the frame 5 of the machine, the clips 13 being preferably so constructed that the trunnions 11 will extend substantia y in vertical line with the male elements of the machine.

The upper and lower portions of the arms 15 are relatively offset, as clearly illustrated in Fig. 1, and are connected by inclined sectlons 16 forming cams, these offset portions of the guard-proper being so disposed relative to each other that the lower portion of 2 upon the descent ofthe plunger 7, comprise projections 18 provided on plates 19.

secured by screws 20 to opposite sides of the plunger 7 in position to engage the upper, cam surfaces, of the deflected portions 1.6 of the arms 15, as represented in Fig.1 1, springs 21 each connected at-one end with the frame 5 of the machine and at/its 0ppo-, I, site end to the adjacent arm 15 of the guardproper 10, servlng to normally hold the guard-proper in retracted position when the plunger is raised (Fig. 1) and return guideproper to this position after it has been moved to the position illustrated in Fig. 2,

upon the plunger returning to raised position.

raised position,the pins 18 engage at rollers 22 thereon preferably with the'upper portions of the cam surfaces 16 and the guard is in such position, as represented, as not to ,interfere with the positioning of the work on the die block 9. As the plunger 7 begins In the. normal position of the machine, namely, that in which the plunger 7 is in to descend, the pins 18, by moving in a vertical path in engagement with the cam surfaces 16, swing the guard-proper-lO, against the action of the springs--21, to'the right in Fig. 1, the cross-bar 17 in this movement 

